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Efficiency Optimization of Mini Unmanned Multicopter

Igor Penkov(1*), Dmitri Aleksandrov(2)

(1) School of Engineering, Department of Mechanical and Industrial Engineering, Tallinn University of Technology, Estonia
(2) PLM Group, Estonia
(*) Corresponding author



The article discusses three-, four-, six-, and eight-rotor UAV (Unmanned Aerial Vehicle) mini helicopters in respect to power consumption. A tricopter has most long flight time, but despite this fact, the most effective is a quadcopter. CFD (Computational Fluid Dynamics) simulations were made with purpose to find more optimal relationship between coaxial rotors. It is shown that the total lifting force generated by a pair of coaxial rotors is less than the lifting force generated by two separately standing rotors of the same size. The flow from the upper rotor in a coaxial rotor pair partially compensates the pressure near the lower rotor. The most effective is use of two rotors with the same geometrical parameters. A less efficient scheme is with the smaller rotor located on top and the larger one in the bottom.
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UAV; CFD Simulation; Multicopter; Lift Force; Rotor; Energy Saving

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